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        <h1>04-数据表示-2</h1>
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      <h1 id="名词解释"><a href="#名词解释" class="headerlink" title="名词解释"></a>名词解释</h1><h2 id="ASCII"><a href="#ASCII" class="headerlink" title="ASCII"></a>ASCII</h2><p>ASCII, abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices.</p>
<h2 id="Color"><a href="#Color" class="headerlink" title="Color"></a>Color</h2><p>Color (American English), or colour (Commonwealth English), is the characteristic of visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.</p>
<h2 id="回答问题"><a href="#回答问题" class="headerlink" title="回答问题"></a>回答问题</h2><ol>
<li><p>A 的 ASCII 编码：65，Unicode 编码：\u0041，utf-8 编码：A；”中“的ASCII 编码：&amp;#20013;，Unicode 编码：\u4e2d，utf-8 编码：&amp;#x4E2D;。</p>
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<li><p>黄色的 RGB 编码是 (255, 255, 0)。</p>
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<li><p>下载 lena.bmp 并分别另存为 jpg 和 png：</p>
<p>lena.bmp：</p>
<p><img src="/assets/4/lena.bmp" alt="lena.bmp"></p>
<p>lena.jpg：</p>
<p><img src="/assets/4/lena.jpg" alt="lena.jpg"></p>
<p>lena.png：</p>
<p><img src="/assets/4/lena.png" alt="lena.png"></p>
<p>BMP 和 PNG 显示质量最好，JPG 压缩率为 94%，PNG 压缩率为 100%。</p>
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<li><p>WinRAR 压缩文件是 lossless 方法。</p>
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            发布于&nbsp;
            <time datetime="2020-10-07T13:44:22.028Z" itemprop="datePublished">
              2020-10-07
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